The terrace volume calculation functions (Terrace Volume, Fixed Slope Banks and Variable Slope Banks) allow you to output details of the volumes in depth ranges.
All three calculation methods result in the same overall cut and fill volumes. In other words, your choice of calculation method does not affect the volume calculation in any way, it merely changes the way the volume calculation is reported.
There are three ways of calculating the volumes by depth range:
Band
Prism
The Band method of calculation subdivides the calculated volume for a particular depth into the various depth bands consisting of the actual cut or fill depth AND all the preceding bands. This is in accordance with the SABS 1200 method of volume calculation.
For the following depth increments:
The volumes are calculated as follows.
The following output results.
Terrace Volume
==============
Volume for Terrace :
Ground Surface : Surface 1
Terrace Surface : Surface 2
Grid Interval : 0.100
The unadjusted volumes are :-
240.00 cu.m. total Cut.
240.00 cu.m. total Fill.
127.20 sq.m. total area in Cut.
127.20 sq.m. total area in Fill.
NOTE: Volume table is calculated in bands
Depth (m) Cut (cu.m.) Fill (cu.m.)
================ =========== ============
0.000 to 0.625 75.781 75.781
0.625 to 1.250 65.094 65.094
1.250 to 1.875 54.688 54.688
1.875 to 2.500 44.438 44.438
2.500 to 3.125 0.000 0.000
3.125 to 4.000 0.000 0.000
4.000 to 5.000 0.000 0.000
Using the Band method of calculating volumes:
The volume of excavation up to 1m is calculated and assigned to the depth range 0m-1m.
The volume of excavation between 1m and 2m is calculated and assigned to the depth range 1m-2m.
The Prism method of calculation assigns the entire calculated volume for a particular depth to the depth band of the actual cut or fill depth.
For the following depth increments:
The volumes a calculated as follows.
The following output results.
Terrace Volume
==============
Volume for Terrace :
Ground Surface : Surface 1
Terrace Surface : Surface 2
Grid Interval : 0.100
The unadjusted volumes are :-
240.00 cu.m. total Cut.
240.00 cu.m. total Fill.
127.20 sq.m. total area in Cut.
127.20 sq.m. total area in Fill.
NOTE: Volume table is calculated by prism
Depth (m) Cut (cu.m.) Fill (cu.m.)
================ =========== ============
0.000 to 0.625 5.219 5.219
0.625 to 1.250 15.906 15.906
1.250 to 1.875 26.313 26.313
1.875 to 2.500 192.563 192.563
2.500 to 3.125 0.000 0.000
3.125 to 4.000 0.000 0.000
4.000 to 5.000 0.000 0.000
5.000 to 6.000 0.000 0.000
6.000 to 7.000 0.000 0.000
7.000 to 8.000 0.000 0.000
Over 8.000 0.000 0.000
----------- ------------
240.000 240.000
----------- ------------
Using the Prism method of calculating volumes, the volume of excavation from 0m-2.5m is calculated and assigned to the depth range 2m-3m.
There is a relationship between Band and Prism calculations, in that the volume for any depth range calculated by the Prism method is equal to the sum of the volume for that depth range AND all preceding depth ranges when calculated by the Band method.
The Contour calculation method assigns the entire calculated volume between two consecutive contours to the contour band of the actual cut or fill depth.
For the following contour interval:
The volumes are calculated as follows.
The following output results.
Terrace Volume
==============
Volume for Terrace :
Ground Surface : Surface 1
Terrace Surface : Surface 2
Grid Interval : 0.100
The unadjusted volumes are :-
240.00 cu.m. total Cut.
240.00 cu.m. total Fill.
127.20 sq.m. total area in Cut.
127.20 sq.m. total area in Fill.
NOTE: Volume table is calculated by contour
Contour (m) Cut (cu.m.) Fill (cu.m.)
================ =========== ============
522.000 to 523.000 35.200 0.000
523.000 to 524.000 89.600 0.000
524.000 to 525.000 115.200 0.000
525.000 to 526.000 0.000 115.200
526.000 to 527.000 0.000 89.600
527.000 to 528.000 0.000 35.200
----------- ------------
240.000 240.000
----------- ------------
Volumes adjusted for 100.00% compaction and 0.00m topsoil stripping :-
240.00 cu.m. Cut available for Fill
240.00 cu.m. of Fill is required giving:-
0.00 cu.m. of Fill shortfall and:-
0.00 cu.m. of Topsoil to be stripped